Re: [CAD_CAM_EDM_DRO] Denford Orac CNC

Hello John,
I will answer just to this because of the rest I have no clue:

johnhe-uk wrote:

>
> . I went for a poodle down to the boat building area of Merseyside and sourced some heavy U shaped channelling for the bed support rarther than cast it like it's suggested. I took the chunk into school ...

We had a really good talk for a while and he told me he'd put it on a
surface grinder etc. for me,...

Every piece of metal that you grind will bend because of built up
stresses. And construction steel (better said iron) will turn into
a Robin Hood bow. That is the reason why you normally use aged cast
iron for suports of longer machines
On tiny small and short machines you have no trouble with a
ground U channel.
But please allways check and match the contact faces with prussian blue
and scrape or hand grind the peakes away until the machine sits flat
befor bolting it down.
Have fun and good luck.
Sven Peter